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分享gcc version 5.1.0 (tdm-1)(32bit) 不能内联 SSE 指令集汇编？
想对2个128bit的数据进行按位与运算，主要几句汇编怎么写？
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赵4老师 2018-09-12
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《The Intel 64 and IA-32 Architectures Software Developer's Manual》
赵4老师 2018-09-12
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The _emit Pseudoinstruction
Home | Overview | How Do I
The _emit pseudoinstruction is similar to the DB directive of MASM. You use _emit to define a single immediate byte at the current location in the current text segment. However, _emit can define only one byte at a time, and it can only define bytes in the text segment. It uses the same syntax as the INT instruction.
The following fragment places the given bytes into the code:
#define randasm __asm _emit 0x4A __asm _emit 0x43 __asm _emit 0x4B
.
.
.
__asm {
randasm
}
不知道gcc汇编有没有类似关键字。
日立奔腾浪潮微软松下联想 2018-09-12
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#include <intrin.h>
__m128i a, b;
__asm(
"movdqa %0,%%xmm0\n\t"
"por %1,%%xmm0\n\t"
"movdqa %%xmm0,%0\n\t"
:
:"m"(a), "m"(b)
);
__m128i a, b;
__asm(
"movdqa %0,%%xmm0\n\t"
"por %1,%%xmm0\n\t"
"movdqa %%xmm0,%0\n\t"
:
:"m"(a), "m"(b)
);
